Event-Triggered Security Output Feedback Control for Networked Interconnected Systems Subject to Cyber-Attacks

This article studies the security of networked interconnected systems (NISs) subject to cyber-attacks based on a new event-triggered mechanism (ETM). NISs with spatially distributed subsystems are vulnerable to cyber-attacks. With a new concept of security control, attention is focused on designing a novel ETM together with a decentralized output feedback control (DOFC) scheme such that the NIS subject to cyber-attacks is stable in secure sense. Under the proposed ETM, the average data-releasing rate over the whole operating period can be extremely decreased, thereby reducing the burden of network bandwidth, computation, and battery-supply. Moreover, during the system with external disturbance or attack on the communication network, more transmission-events can be generated than other periods. As a result, the desired control performance can be achieved. By using stochastic analysis techniques and Lyapunov stability theory, sufficient conditions are derived to obtain both the controller gains and the parameters of the ETM. Numerical simulation of chemical reactor systems is given to illustrate the advantages and effectiveness of the proposed theories and design techniques.

Automated summary

This article studies the security of networked interconnected systems (NISs) subjected to cyber-attacks using a new event-triggered mechanism (ETM) and decentralized output feedback control (DOFC) scheme. The proposed ETM reduces the data-releasing rate, thereby decreasing network burden, and generates more transmission events during external disturbances or attacks to achieve desired control performance. Stochastic analysis techniques and Lyapunov stability theory are used to derive sufficient conditions for obtaining controller gains and ETM parameters. Simulation results on chemical reactor systems demonstrate the advantages and effectiveness of the proposed theories and design techniques.